First Tableau visualization - Dashboard Guide

Dashboard Mode - First Tableau visualization

Dashboard Goal

Show total sales and sales by product category to understand which category sells best.

Sample Data

Order ID	Product Category	Sales	Order Date
1001	Furniture	200	2024-01-05
1002	Office Supplies	150	2024-01-06
1003	Technology	300	2024-01-07
1004	Furniture	450	2024-01-08
1005	Technology	500	2024-01-09
1006	Office Supplies	100	2024-01-10
1007	Furniture	350	2024-01-11

Dashboard Components

• KPI Card: Total Sales
  Formula: SUM([Sales])
  Result: 2050
• Bar Chart: Sales by Product Category
  Formula: SUM([Sales]) grouped by [Product Category]
  Results:
  - Furniture: 1000
  - Office Supplies: 250
  - Technology: 800
• Table: Detailed Sales Data
  Shows all rows from sample data with columns Order ID, Product Category, Sales, Order Date

Dashboard Layout

+----------------------+-------------------------+
|      Total Sales      |  Sales by Product Cat.  |
|       (KPI Card)      |       (Bar Chart)       |
+----------------------+-------------------------+
|                  Detailed Sales Data                |
|                        (Table)                      |
+-----------------------------------------------------+
    

Interactivity

A filter on Product Category lets users select one or more categories.

When a category is selected, the KPI card updates total sales for that category only.

The bar chart updates to show sales only for selected categories.

The detailed sales table filters to show only orders from the selected categories.

Self Check

If you add a filter for Product Category = Technology, which components update?

• The Total Sales KPI updates to show 800.
• The Bar Chart shows only the Technology category bar.
• The Detailed Sales Table shows only rows with Technology category.

Key Result

A simple Tableau dashboard showing total sales, sales by product category, and detailed sales data with interactive category filter.

Practice

1. In Tableau, what is the main purpose of dragging a Dimension field to the Rows or Columns shelf?

easy

A. To perform calculations on numerical data

B. To filter out unwanted data from the view

C. To group or categorize data in the visualization

D. To change the color of the chart elements

Solution

1. Step 1: Understand Dimensions in Tableau

   Dimensions are fields that contain categorical data used to group or segment data.

2. Step 2: Role of Rows and Columns shelves

   Dragging a Dimension to Rows or Columns organizes data into groups along those axes.

3. Final Answer:

   To group or categorize data in the visualization -> Option C

4. Quick Check:

   Dimensions group data [OK]

Hint: Dimensions group data on axes, measures show numbers [OK]

Common Mistakes:

• Confusing dimensions with measures
• Thinking dimensions perform calculations
• Using dimensions to filter instead of group

2. Which of the following is the correct way to create a simple bar chart in Tableau?

easy

A. Drag a Measure to Filters and a Dimension to Tooltip

B. Drag a Measure to Rows and a Dimension to Columns

C. Drag a Dimension to Filters and a Measure to Color

D. Drag a Dimension to Pages and a Measure to Detail

Solution

1. Step 1: Identify bar chart basics

   A bar chart shows measure values grouped by dimension categories.

2. Step 2: Correct shelf placement

   Placing a Measure on Rows and a Dimension on Columns creates bars grouped by dimension.

3. Final Answer:

   Drag a Measure to Rows and a Dimension to Columns -> Option B

4. Quick Check:

   Measure on Rows + Dimension on Columns = Bar chart [OK]

Hint: Bar charts need measure on Rows and dimension on Columns [OK]

Common Mistakes:

• Putting measures on Filters instead of Rows or Columns
• Using Dimensions in Filters instead of Rows/Columns
• Confusing Color or Tooltip with main chart axes

3. Given a dataset with Category as a Dimension and Sales as a Measure, what will Tableau display if you drag Category to Columns and SUM(Sales) to Rows?

medium

A. A bar chart showing total sales for each category

B. A pie chart showing sales distribution by category

C. A table listing categories and sales values

D. A scatter plot with categories on X and sales on Y

Solution

1. Step 1: Understand shelf placement effect

   Category on Columns creates groups along horizontal axis; SUM(Sales) on Rows creates vertical bars.

2. Step 2: Default chart type for this setup

   Tableau defaults to bar chart when a dimension and aggregated measure are placed on Columns and Rows.

3. Final Answer:

   A bar chart showing total sales for each category -> Option A

4. Quick Check:

   Dimension + SUM(Measure) = Bar chart [OK]

Hint: Dimension on Columns + SUM(Measure) on Rows = bar chart [OK]

Common Mistakes:

• Expecting pie chart without selecting it
• Thinking Tableau shows table by default
• Confusing scatter plot with bar chart

4. You tried to create a bar chart by dragging Sales to Columns and Category to Rows, but Tableau shows a single bar instead of multiple bars. What is the likely issue?

medium

A. You dragged the Measure to Columns instead of Rows

B. The data source has no categories

C. You forgot to aggregate the Sales field

D. The Category field is treated as a Measure, not a Dimension

Solution

1. Step 1: Check field data types

   If Category is treated as a Measure, Tableau aggregates it, losing grouping.

2. Step 2: Effect on visualization

   Without Category as Dimension, Tableau shows one aggregated bar instead of multiple.

3. Final Answer:

   The Category field is treated as a Measure, not a Dimension -> Option D

4. Quick Check:

   Category must be Dimension for multiple bars [OK]

Hint: Ensure categories are Dimensions, not Measures [OK]

Common Mistakes:

• Assuming measure placement causes single bar
• Not checking field data type
• Ignoring data source structure

5. You want to create a stacked bar chart in Tableau showing Sales by Category and colored by Region. Which steps should you follow?

hard

A. Drag Category to Columns, SUM(Sales) to Rows, and Region to Color

B. Drag Region to Columns, Category to Rows, and Sales to Filters

C. Drag Sales to Columns, Region to Rows, and Category to Tooltip

D. Drag Category to Filters, Region to Color, and Sales to Detail

Solution

1. Step 1: Place Category and Sales for bar chart

   Category on Columns groups bars; SUM(Sales) on Rows sets bar height.

2. Step 2: Add Region to Color for stacking

   Dragging Region to Color splits bars by region colors, creating stacked bars.

3. Final Answer:

   Drag Category to Columns, SUM(Sales) to Rows, and Region to Color -> Option A

4. Quick Check:

   Category + SUM(Sales) + Region on Color = Stacked bar [OK]

Hint: Use Color shelf to stack bars by category [OK]

Common Mistakes:

• Putting Region on Rows or Filters instead of Color
• Not aggregating Sales
• Using Tooltip or Detail instead of Color for stacking